This manual is designed to provide guidance to those who prepare reports on spill episodes to the Division of Oil and Special Materials Control, and who expect to access the system for developing Regional analytical studies. The increasing number of spills reports and the need for more accurate statistical analysis of episodes, make it imperative that Regions report promptly and in accordance with this manual in order that data are available to the Congress, EPA top management, the Office of Management and Budget, and the Public. Even more important is the need for a capability to fully support the Spill Prevention Program and assess its effectiveness.